spring事物不回滚的问题。 400 请求出错 

<!-- 读配置文件通过数据库连接池连接数据库 --> 
 <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"> 
  <property name="driverClassName"><value>com.mysql.jdbc.Driver</value></property> 
  <property name="url"><value>jdbc:mysql://localhost:3306/****?useUnicode=true&characterEncoding=UTF8&zeroDateTimeBehavior=convertToNull</value></property> 
  <property name="username"><value>****</value></property> 
  <property name="password"><value>****</value></property> 
 </bean> 
 <!-- 配置数据库事务管理 -->
 <bean id="transactionManager"  class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> 
  <property name="dataSource" ref="dataSource" /> 
 </bean>
 <!-- 配置事务特性 -->
    <tx:advice id="txAdvice" transaction-manager="transactionManager"> 
     <tx:attributes> 
       <tx:method name="add*" propagation="REQUIRED" rollback-for="RuntimeException" /> 
       <tx:method name="update*" propagation="REQUIRED" rollback-for="RuntimeException"/> 
       <tx:method name="delete*" propagation="REQUIRED" rollback-for="RuntimeException"/> 
        <tx:method name="*" read-only="true"/> 
     </tx:attributes> 
    </tx:advice> 
 <!-- 配置哪些方法需要配置事务管理   -->
    <aop:config > 
     <aop:pointcut id="allServiceMethod"   expression="execution(public * com.flipnetwork.flip.logic.*.*(..))" /> 
     <aop:advisor advice-ref="txAdvice" pointcut-ref="allServiceMethod"/> 
    </aop:config> 

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ApplicationContext act = new ClassPathXmlApplicationContext("applicationContext.xml");
  IUserLogic  us = (IUserLogic)act.getBean("userlogic");
   
    User user1 = new User();
    user1.setUsername("cba");
    user1.setPassword("xyzxyzxyzxyz");
    user1.setLoginname("zyxxx");
    User user = new User();
    user.setUsername("abc444444");
    user.setPassword("xyz");
    user.setLoginname("tttt");
    us.addsignin(user1);
    us.addsignin(user);会出错！

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没有回滚。插入一条数据。